简介：Thesecond-harmonicgeneration(SHG)circulardichroisminthelightofreflectionfromchiralfilmsoftripod-likechiralmoleculesisinvestigated.Theexpressionsofthesecond-harmonicgenerationcirculardichroismarederivedfromourpresentedthree-coupled-oscillatormodelforthetripod-likechiralmolecules.SpectraldependenceofthecirculardichroismofSHGfromfilmsurfacecomposedoftripod-likechiralmoleculesissimulatednumericallyandanalysed.Influenceofchiralparametersonthesecond-harmonicgenerationcirculardichroismspectruminchiralfilmsisstudied.Theresultshowsthatthesecond-harmonicgenerationcirculardichroismisasensitivemethodofdetectingchiralitycomparedwiththeordinarycirculardichroisminlinearoptics.Allofourworkindicatesthattheclassicalmolecularmodelsareveryeffectivetoexplainthesecond-harmonicgenerationcirculardichroismofchiralmolecularsystem.Theclassicalmolecularmodeltheorycangiveusaclearphysicalpictureandbringsusveryinstructiveinformationaboutthelinkbetweenthemolecularconfigurationandthenonlinearprocesses.
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